Final answer:
Methylphenidate can cause elevated blood pressure and heart rate as an adverse effect.
Step-by-step explanation:
Methylphenidate, also known as Ritalin, is a stimulant drug commonly used to treat ADHD. One of the adverse effects of Methylphenidate is elevated blood pressure and heart rate. This is because the drug stimulates the central nervous system, leading to increased heart activity. The nurse should monitor the child for signs of elevated blood pressure and heart rate while on Methylphenidate.